Resorcinol-Based Rubber Composition for Tire Rigidity
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional rubber compositions for tires face challenges in achieving high rigidity while maintaining low deformation properties, as high sulfur levels lead to premature aging and formaldehyde production, and traditional reinforcing resins can crosslink too quickly, hindering shaping and degrading mechanical properties.
Innovation Solution
A rubber composition incorporating an aldehyde of specific formula and an aromatic polyphenol derivative, which forms a resin that provides equivalent or greater low-strain rigidity without formaldehyde production and delays crosslinking, allowing for better processing and temperature resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a concentrated vulcanization system with high sulfur levels is used to achieve high rigidity, then low deformation resistance is improved, but raw aging is penalized with sulfur migration and flushing
Solution Approach 1:
The patent changes the chemical composition parameters by replacing conventional phenolic resins with resorcinol-based resins and adjusting the sulfur content to 2-5 phr, which modifies the vulcanization kinetics to prevent sulfur migration while maintaining rigidity
Solution Approach 2:
The patent creates a composite system combining resorcinol-based resin, specific aromatic polyphenol derivatives, and controlled sulfur content to achieve a balanced formulation that provides both rigidity and aging stability
2Strength
If a concentrated vulcanization system is used to achieve high rigidity, then low deformation resistance is improved, but delay phase is reduced leading to premature cooking
Solution Approach 1:
The patent modifies the vulcanization parameter profile by using resorcinol-based resin with controlled aromatic polyphenol derivative content (1-5 phr), which extends the delay phase while maintaining the rigidity enhancement effect
3Strength
If reinforcing load rate is increased to achieve high rigidity, then low deformation resistance is improved, but hysteresis and rolling resistance are penalized
Solution Approach 1:
The patent changes the compositional parameters by optimizing the ratio of resorcinol-based resin to aromatic polyphenol derivative, achieving rigidity enhancement with minimal impact on hysteresis and rolling resistance
4Strength
If conventional phenolic resin with HMT or H3M is used to achieve high rigidity, then low deformation resistance is improved, but formaldehyde is produced
Solution Approach 1:
The patent extracts and eliminates the formaldehyde-producing components (conventional phenolic resins combined with HMT/H3M) and replaces them with resorcinol-based resins that do not generate formaldehyde during vulcanization
Solution Approach 2:
The patent uses resorcinol-based resin as a more environmentally friendly alternative to conventional phenolic resins, sacrificing none of the rigidity-enhancing properties while eliminating the harmful formaldehyde byproduct
5Strength
If reinforcing resin is used to achieve high rigidity, then low deformation resistance is improved, but crosslinking occurs too quickly hindering shaping
Solution Approach 1:
The patent adjusts the chemical parameters by using resorcinol-based resin with controlled aromatic polyphenol derivative content, which slows down the crosslinking rate to allow adequate time for shaping operations while still achieving the desired rigidity
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The composition achieves improved low-strain rigidity, delayed crosslinking, and enhanced temperature resistance, enabling better processing and maintaining rigidity without the environmental concerns of formaldehyde.
Implementation Method 1
The terms 'methylene acceptor' and 'methylene donor' are well known to those skilled in the art and widely used to designate compounds capable of reacting together to generate by condensation a three-dimensional reinforcing resin
Implementation Method 2
which forms a resin that provides equivalent or greater low-strain rigidity without formaldehyde production and delays crosslinking
Data Source
Figure 1~2
AI summary
The invention relates to a rubber composition comprising at least one resin based on: A1) at least one aldehyde of formula W in which each group Ar1 and Ar2 is an optionally substituted aromatic core, independently from each other, and SP is a linking group linking at least the groups Ar1 and Ar2 together, SP separating the groups Ar1 and Ar2 by at least two covalent bonds; and A2) at least one derivative of an aromatic polyphenol comprising at least one aromatic core carrying at least two -O-Z groups in meta position in relation to each other, the two ortho positions of at least one of the -O-Z groups being non-substituted, Z being different from hydrogen.